Printed encyclopedias and other books with definitions for Graham Bell

A little later, but no doubt quite independently, Elisha Gray of Chicago, and
Graham Bell of Canada, made a similar application of Helmholtz's principle. In
the Centennial Exhibition of Philadelphia, Elisha Gray successfully showed in the
presence of the Emperor of Brazil the transmission of four messages
simultaneously through one wire by long and short sounds (for the 'dot' and 'dash'
of the Morse alphabet) produced by the vibrations of four tuning-forks of different
periods at the ...

Alexander Graham Bell and Edison were both working on the multiple telegraph
with financial backing. The hope was that the multiple telegraph could break the
monopoly held by Western Union Telegraph Company. Bell demonstrated the
ability to “talk” with electricity in 1874, which shifted the research effort from the
telegraph to the telephone. This development allowed him to have two investors,
Gardiner Hubbard and Thomas Sanders, to finance the initial development work.